Add iOS platform version automatically in e2e tests

When running the iOS e2e tests locally, we no longer require to specify the platform version because we can fetch the available iOS simulator runtimes and pick the latest one.

packages/react-native-editor/__device-tests__/helpers/caps.js

@@ -13,7 +13,6 @@ const ios = {
 
 exports.iosLocal = {
 	...ios,
-	platformVersion: '14.2',
 	deviceName: 'iPhone 11',
 };
 

packages/react-native-editor/__device-tests__/helpers/utils.js

@@ -55,6 +55,18 @@ const isLocalEnvironment = () => {
 	return testEnvironment.toLowerCase() === 'local';
 };
 
+const getIOSPlatformVersions = () => {
+	const { runtimes = [] } = JSON.parse(
+		childProcess.execSync( 'xcrun simctl list runtimes --json' ).toString()
+	);
+
+	return runtimes
+		.reverse()
+		.filter(
+			( { name, isAvailable } ) => name.startsWith( 'iOS' ) && isAvailable
+		);
+};
+
 // Initialises the driver and desired capabilities for appium
 const setupDriver = async () => {
 	const branch = process.env.CIRCLE_BRANCH || '';
@@ -105,6 +117,31 @@ const setupDriver = async () => {
 		desiredCaps.app = `sauce-storage:Gutenberg-${ safeBranchName }.app.zip`; // App should be preloaded to sauce storage, this can also be a URL
 		if ( isLocalEnvironment() ) {
 			desiredCaps = _.clone( iosLocal );
+
+			const iosPlatformVersions = getIOSPlatformVersions();
+			if ( iosPlatformVersions.length === 0 ) {
+				throw new Error(
+					'No iOS simulators available! Please verify that you have iOS simulators installed.'
+				);
+			}
+			// eslint-disable-next-line no-console
+			console.log(
+				'Available iOS platform versions:',
+				iosPlatformVersions.map( ( { name } ) => name )
+			);
+
+			if (
+				! desiredCaps.platformVersion &&
+				iosPlatformVersions.length > 0
+			) {
+				desiredCaps.platformVersion = iosPlatformVersions[ 0 ].version;
+
+				// eslint-disable-next-line no-console
+				console.log(
+					`Using iOS ${ desiredCaps.platformVersion } platform version`
+				);
+			}
+
 			desiredCaps.app = path.resolve( localIOSAppPath );
 		}
 	}